1、_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.Copyright 2013 SAE InternationalAll rights reserved. No part of this publication may b
3、e reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970 (outside USA)Fax
4、: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS6527EAEROSPACEMATERIALSPECIFICATIONAMS6527 REV. EIssued 1980-07Revised 2013-08Superseding AMS6527DStee
5、l, Bars and Forgings2.0Cr - 10Ni - 14Co - 1.0Mo (0.15 - 0.19C)Vacuum Melted, Normalized and Overaged(Composition similar to UNS K92571)RATIONALEAMS6527E results from a Five Year review and update of this specification.1. SCOPE1.1 FormThis specification covers a premium aircraft-quality alloy steel i
6、n the form of bars, forgings, and forging stock.1.2 ApplicationThese products have been used typically for heat treated parts requiring a combination of high strength, toughness, and weldability, but usage is not limited to such applications.2. APPLICABLE DOCUMENTSThe issue of the following document
7、s in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has
8、 been specified, the last published issue of that document shall apply.2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2251 Tolerances, Low-Alloy Steel Bar
9、sAMS2248 Chemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron AlloysAMS2300 Steel Cleanliness, Premium Aircraft-Quality, Magnetic Particle Inspection ProcedureAMS2310 Qualification Sampling and Testing of Steels, Transvers
10、e Tensile PropertiesSAE AMS6527E Page 2 of 9AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging StockAMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel ForgingsAMS2750 PyrometryAMS2806 Identification, Bars, Wire, Mechanical
11、Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and AlloysAMS2808 Identification, ForgingsAS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing2.2 ASTM PublicationsAvailable from ASTM Internatio
12、nal, 100 Barr Harbor Drive, P. O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and BilletsASTM E 8 / E 8M Tension Testing of Metallic MaterialsASTM E 18 Rockwell Hardness of Metallic MaterialsASTM
13、 E 23 Notched Bar Impact Testing of Metallic MaterialsASTM E 45 Determining the Inclusion Content of SteelASTM E 112 Determining Average Grain SizeASTM E 353 Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron AlloysASTM E 384 Knoop and Vickers Hardness o
14、f MaterialsASTM E 399 Plane-Strain Fracture Toughness of Metallic Materials3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 353, by spectrochemical methods, or by other analytical methods
15、 acceptable to purchaser.SAE AMS6527E Page 3 of 9TABLE 1 - COMPOSITIONElement min maxCarbon 0.15 0.19Manganese - 0.10Silicon - 0.10Phosphorus - 0.008Sulfur - 0.005Phosphorus + Sulfur - 0.010Chromium 1.80 2.20Nickel 9.50 10.50Cobalt 13.50 14.50Molybdenum 0.90 1.10Titanium - 0.015Aluminum - 0.015Oxyge
16、n - 0.0020 (20 ppm)Nitrogen - 0.0015 (15 ppm)3.1.1 Check AnalysisComposition variations shall meet the applicable requirements of AMS2248.3.2 Melting PracticeSteel shall be multiple melted using vacuum induction melting followed by vacuum consumable electrode practice.3.3 ConditionThe product shall
17、be supplied in the following condition:3.3.1 Bars and ForgingsNormalized and overaged with hardness not higher than 36 HRC, or equivalent (See 8.2), determined in accordance with ASTM E 18. Bar shall not be cut from plate.3.3.2 Forging StockAs ordered by the forging manufacturer.3.4 Heat TreatmentSh
18、all conform to the following:3.4.1 Bars and ForgingsShall be normalized by heating to 1650 F 25 (899 C 14), holding at heat for 60 minutes 5, and cooling to room temperature at a rate equivalent to a still air cool or faster, and overaged by heating to 1250 F 25 (677 C 14), holding at heat for not l
19、ess than six hours, and fan-air cooling. Pyrometry shall be in accordance with AMS2750.3.5 PropertiesThe product shall conform to the following requirements:SAE AMS6527E Page 4 of 93.5.1 MacrostructureVisual examination of transverse full cross-sections from bars, billets, and forging stock, etched
20、in hot hydrochloric acid in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM A 604 shown in Table 2.TABLE 2 - MACROSTRUCTURE LIMITSClass Condition Severity1Freckles A2 White Spots A3 Ra
21、dial Segregation B4 Ring Pattern B3.5.2 Micro-Inclusion RatingNo specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E 45, Method D, except that the length of any inclusion shall be not greater than 0.015 inch (0.38 mm).TABLE 3 - MICRO-INCLUSION RATING LIMITSAABBCCD
22、DField Thin Heavy Thin Heavy Thin Heavy Thin HeavyWorst Field Severity 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0Worst Field Frequency,a1a1a131maximumTotal Rateable Fieldsb1b1b181Frequency, maximumaCombined A+B+C, not more than 3 fieldsbCombined A+B+C, not more than 8 fields3.5.2.1 A rateable field is defined
23、as one which has a type A, B, C, or D inclusion rating of at least 1.0 thin or heavy in accordance with the Jernkontoret Chart, Plate g44-r, ASTM E 45.3.5.3 Decarburization3.5.3.1 Bars ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces.
24、3.5.3.2 Allowable decarburization of bars and billets ordered for redrawing or forging or to specified microstructural requirements shall be as agreed upon by purchaser and vendor.3.5.3.3 Decarburization of bars to which 3.5.3.1 or 3.5.3.2 is not applicable shall be no greater than shown in Table 4.
25、SAE AMS6527E Page 5 of 9TABLE 4A - MAXIMUM DECARBURIZATION, BARS, INCH/POUND UNITSNominal Diameter or Distance Between Parallel SidesInchesTotal Depth of Decarburization InchUp to 0.375, incl 0.015Over 0.375 to 0.500, incl 0.017Over 0.500 to 0.625, incl 0.019Over 0.625 to 1.000, incl 0.022Over 1.000
26、 to 1.500, incl 0.025Over 1.500 to 2.000, incl 0.030Over 2.000 to 2.500, incl 0.035Over 2.500 to 4.000, incl 0.040TABLE 4B - MAXIMUM DECARBURIZATION, BARS, SI UNITSNominal Diameter or Distance Between Parallel Sides MillimetersTotal Depth of Decarburization MillimetersUp to 9.52, incl 0.38Over 9.52
27、to 12.70, incl 0.43Over 12.70 to 15.88, incl 0.48Over 15.88 to 25.40, incl 0.56Over 25.40 to 38.10, incl 0.64Over 38.10 to 50.80, incl 0.76Over 50.80 to 63.50, incl 0.89Over 63.50 to 101.60, incl 1.023.5.3.4 Decarburization shall be measured by the metallographic method or by a traverse method using
28、 microhardness testing in accordance with ASTM E 384. The microhardness method shall be conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured by the microhardness method, is defined as the
29、 perpendicular distance from the surface to the depth under that surface where there is no further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any decarburization on the adjacent surface. In case of dispute, the depth of decarburiz
30、ation determined using the microhardness traverse method shall govern.3.5.3.4.1 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the limits of Table 4 by more than 0.005 inch (0.13 mm) and the width i
31、s 0.065 inch (1.65 mm) or less.3.5.4 Average Grain SizePrior austenitic grain size shall be ASTM No. 6 or finer for product 100 square inches (645 cm2) and under in cross-sectional area, determined in accordance with ASTM E 112.3.5.5 Response to Heat Treatment3.5.5.1 Bars and ForgingsTest specimens
32、cut from product 100 square inches (645 cm2) and under in cross-sectional area that have been normalized and overaged as in 3.4 shall have the properties specified in 3.5.5.1.1, 3.5.5.1.2, and 3.5.5.1.3 after being heated to 1575 F 25 (857 C 14), held at heat for 60 minutes 5, oil quenched, cooled t
33、o -100 F 15 (-73 C 8), held at temperature for 60 minutes 5, warmed in air to room temperature, and aged by heating to 950 F 10 (510 C 6), holding at heat for not less than five hours, and forced air cooling. The 1650 F 25 (899 C 14) normalized portion of the cycle applied to the test samples may be
34、 deleted if the parent product has previously been treated as in 3.3. SAE AMS6527E Page 6 of 93.5.5.1.1 Longitudinal Tensile PropertiesShall be as shown in Table 5, determined in accordance with ASTM E 8 / E 8M; testing in the longitudinal direction need not be performed on product tested in the tra
35、nsverse direction.TABLE 5 - MINIMUM LONGITUDINAL TENSILE PROPERTIESProperty ValueTensile Strength 235 ksi (1620 MPa)Yield Strength at 0.2% Offset 215 ksi (1482 MPa)Elongation in 4D 12%Reduction of Area 60%3.5.5.1.2 Transverse Tensile PropertiesShall be as shown in Table 6, determined on specimens se
36、lected and prepared in accordance with AMS2310; transverse tensile properties apply only to product that tensile specimens not less than 2.50 inches (63.5 mm) in length can be taken.TABLE 6 - MINIMUM TRANSVERSE TENSILE PROPERTIESProperty ValueTensile Strength 235 ksi (1620 MPa)Yield Strength at 0.2%
37、 Offset 215 ksi (1482 MPa)Elongation in 4D 12%Reduction of Area 55%3.5.5.1.3 Fracture ToughnessShall not be less than 130 ksi (143 Mpa ) KICor KQ,determined in accordance with ASTM E 399, with a B dimension of 1.50 inches (38.1 mm) or greater and W dimenisions as specified. Sample orientation shall
38、be L-S or L-T for billet, rectangular bar, or forging and L-R or L-C for round bar.3.5.5.1.3.1 Testing smaller product not accommodated by 3.5.5.1.3 shall be conducted using Charpy V-notch test in accordance with ASTM E 23, with longitudinal axis parallel to the grain direction. The minimum impact v
39、alue shall be 45 foot pounds (61 J) at room temperature.3.5.5.2 Forging StockWhen a sample of stock is forged to a test coupon and heat treated as in 3.4 and 3.5.5.1, specimens taken from the heat treated coupon shall conform to the requirements of 3.5.5.1.1, and/or 3.5.5.1.2, and 3.5.5.1.3. If spec
40、imens taken from the stock after heat treatment as in 3.4 and 3.5.5.1 conform to the requirements of 3.5.5.1.1 and/or 3.5.5.1.2, and 3.5.5.1.3, tests shall be accepted as equivalent to tests of a forged coupon.3.6 QualityThe product, as received by purchaser, shall be uniform in quality and conditio
41、n, sound, and free from foreign materials and from imperfections detrimental to usage of the product.3.6.1 Steel shall be premium aircraft-quality conforming to AMS2300, except that a maximum average frequency (F) rating of 0.10 and a maximum average severity (S) rating of 0.20 shall apply.3.6.2 Bar
42、s ordered hot rolled or cold drawn, or ground, turned, or polished shall, after removal of the standard stockremoval allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the machined, ground, turned, or polished surface.SAE AMS6527E Page 7 of 93.6.3 Grain flow of
43、die forgings, except in areas which contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow.3.7 TolerancesBars shall conform to all applicable requirements of AMS2251.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionTh
44、e vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements.4.2 Cla
45、ssification of Tests4.2.1 Acceptance TestsThe following requirements are acceptance tests and shall be performed on each heat or lot as applicable:4.2.1.1 Composition (3.1), macrostructure (3.5.1) and micro-inclusion rating (3.5.2) of each heat.4.2.1.2 Hardness (3.3.1), decarburization (3.5.3) and a
46、verage grain size (3.5.4) of each lot.4.2.1.3 Tensile properties (3.5.5.1.1 and/or 3.5.5.1.2) and fracture toughness (3.5.5.1.3) of each lot of bars and forgings after heat treatment.4.2.1.4 Tolerances (3.7) of bars.4.2.2 Periodic TestsThe following requirements are periodic tests and shall be perfo
47、rmed at a frequency selected by the vendor unless frequency of testing is specified by purchaser:4.2.2.1 Ability of forging stock to develop required properties (3.5.5.2).4.2.2.2 Frequency severity cleanliness rating (3.6.1).4.2.2.3 Grain flow of die forgings (3.6.3).4.3 Sampling and TestingShall be
48、 as follows:4.3.1 Bars and Forging StockIn accordance with AMS2370.4.3.2 ForgingsIn accordance with AMS2372.SAE AMS6527E Page 8 of 94.4 Reports4.4.1 The producer of the bars and forgings shall furnish with each shipment a report showing the producer identity and country where the metal was melted (i
49、.e., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, macrostructure, and micro-inclusion rating of each heat, and for hardness, average grain size, and response to heat treatment including tensile properties and fracture toughness of each lot, and stating that the product conforms to the other technical requirements. This repo
